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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e81fc1f68cc867e3107d860777b80bd98006e608e58e290cd6c9850980e773ce' 
  AND token = '11MnEEPTVdR3elvEYnax4beTlnEjT3kO7uCR7HY+054=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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