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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6bcc108046e89c40e31d48702ae2c9da8c1563f9571e7b1f1f93153f1235e4e' 
  AND token = 'DCZG6Tf5MVlqSsxFg7c1RI5qO53+zc7GtON3Kze/QxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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