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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ab4ff209c10d2f5612ab3e05834f6a5a93c14e25d4adb445574cc4cd102b15e' 
  AND token = 'EC5fspNWCy1B1RwwLJitN2SXNJbgYzzqbbWRy0nqr0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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