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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c57a0d44377b30b72184f477b92a39d2cfd146d21995b4028fd90b47c79cac1' 
  AND token = 'LPGv1qvln3r8H6pFkNDrPwumpggwphtc+cD+YeIp5go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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