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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '766cc4d65aab4cc18e7ce484a66694f2ded35b1b07c5aa618ac163e29afdcf02' 
  AND token = 'WWNo1AUzElc9NYdpdb5ge5NGlBI9mk7llafzYFsrLp8=' 
  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"
    }
  }
}