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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '997c8808522466bdbc419cdbb0d774a00d002b4c8f3e08af16c45de92eec4f99' 
  AND token = 'qUjJQMmSN9WMzR6PdyV7TwZPytLe9LgTbXVULuBRMYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00344

JSON explain

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