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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '718a3d19706d057886b409798a166711070c618fcc707e5f05524f65b74e2d4f' 
  AND token = '5Y5dXepHucPzL75xJF4XuDqBJNqbWLInMMpbX9+Obcc=' 
  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"
    }
  }
}