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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61204e0263fe7a5b2344b82384f4575647c49f28d74c7f6dedfab26dc4ffd304' 
  AND token = 'gNRFyQdfnap111FaNDbD16H+o4jfU4tdYvp/5w7mQIM=' 
  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"
    }
  }
}