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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e21ab64a67a6e13791c11c80e8d52f42b34913e2c4ca475f1e1828aa142eb6e7' 
  AND token = 'yiVH8HwQyuFurTjLHhYLGOgvmzpFRALZ1De1pAZeP6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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