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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c55bdae10120faa38e58718308a61e4fac66063b551bf9a12bc2b3ca48e350b5' 
  AND token = 'EPVC1qPILL2bZF0lL67p3LU2QfQdvvYSXa0JrFA1WzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00138

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}