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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72fa79f44cda44f92e5eb50f34ed599af8741c1a6c2a27a2ccdce28e616cd04f' 
  AND token = '+EPJZggftifMS3jTVmTv7MT0GYr4huHgCPR7+6q4yoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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