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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54ec9d774be18fae7f78c2d38d421a7a62221156c6cda5f83e9b240d23ca6064' 
  AND token = 'Y6wY1fe3F2JLjnOwlHvjis7zNwKd1PTBxjPfE5iv8IM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00123

JSON explain

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