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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cae11af3b3fb47c1e0f4b4d7f434880f5cfbcebefbfcb8d701c7e5698ae173e7' 
  AND token = '+UxTXgO5LmgYbKHLx5KL4BdXcKb5cpIqmjCW1fdAmg0=' 
  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"
    }
  }
}