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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1d5340359cdee2517764f5c42ca243db30b7fad63bf3ea566c7d9f4b1690f52' 
  AND token = '8OIICE0CmgCYgcvQuhQUeAZUUxTpGNFvqnqQQIZbxh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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