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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcb4c6f6cf30b6bce338e1130d9f1331b6210aac45e6212d49a3c6acf383e9f0' 
  AND token = 'tVFBHT8mSM7LcCyCNFd/+YmidPYlNTlN6NuEF0A93+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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