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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dd19f4c90e9e97b3698f1add6a0b7c51fac6fb4cf9c3e6060b002a1d655c6d2' 
  AND token = 'e03C0yeCEY8gw21F/NqsfzK8hp4LQNfYz+sMjnolEqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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