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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc3edb9a8e52204b4a9fddb4c78529ccf00642c6630edd979388d5eb8a93960e' 
  AND token = 'n9kINSQ8ODuDMKN31ACv+6hgXhmOjyx82oKtpNj3fwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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