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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0688635814bbd4a612cf84a27d74792636e3a496bff063550656d2d80196b8e1' 
  AND token = '9wc9XNarj/CQwSwUgeBxAvwlD8ulE0jx2DWwuHjWKR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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