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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b04ec0cac64f5207c1eefa5115faa91b5d3e025778ef1322707497b852362743' 
  AND token = 'DiTO6PzGukL8/485MpqiuB3E+nWE0u25o15I48dnwNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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