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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '907932f3c082c990823c2e6ee69d0944a1356bfb5902f4f78684985ec81a9332' 
  AND token = 'F96tggkvaoJmvO0ziOhI/3N9rbTaKExpsp86RbydfqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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