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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4caef36129cca68217d2dfd23a6db6d34d7e06e86c8913f62fd52c66e384ff33' 
  AND token = '1oioWN6JrF+LGcoh0ZH1uVAcYzdF5PgsjfY7UInsn60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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