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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5528f2ebe0ea3e23cf00c396a3b5d670b2ca95868bc7ea9b2e97f7a4496b766' 
  AND token = 'yN3/oEQulN88Qz2PRaXm6+dYwCZ+gPZNnSbtWVlHhL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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