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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eccfb14c572677f4eb5d871f3b4fc1c96b82904d41b7919a7f3e025f2d4c6d50' 
  AND token = 'smdUdgAoj1irMySzyVlP57SAo1eA7J/6Y2WxsinmpCc=' 
  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"
    }
  }
}