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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94b965eb018c99f607d46dd65c506845eb29f9749575fffe6e3f8b5bae35aec2' 
  AND token = 'M7RrQ0H7z16IUqu54skm7tFtTy9TFtSZ+dKTVfXiF6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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