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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '691b225a24c12472bd4f30827023abcddff614b59084c7a04b9da4b9c6ba8410' 
  AND token = 'CdWb08VnRuyjEYS3F3n06t84u1Zxnb12eXBHV0v+hco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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