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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f95717f9bdd5105bb620d242965013c47a03ad2c8a89f160bd9a31fb707a1f9d' 
  AND token = 'y5/DW7CMhj+OzMQo1qNOuFn+ehE8s50XnLsDuVC8c6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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