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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5667ddb776f68dc7ab54859631751e5fc3d9b3bc6543bb27daf59b6becfa39c4' 
  AND token = '7UuA1/6ppeR9F2MeQlpAio4WF+1MWDLEEO/ZJQknbnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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