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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc9f1959676c9ca64593fc14c59990e3f9d1d4849847006e40868bb608a18f56' 
  AND token = 'pSwj3VPuorjI8ockArVNSfUWNKQYBJ2YfXHSgBDDcoI=' 
  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"
    }
  }
}