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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '952f3d6a8320a1efa8b39635108391d45accdc8ae95edbb859cefc64b354c3c7' 
  AND token = 'rK5y7k7VbUPyujZrNVCHoAzBR9aUYbPJ0/cBX9fwtPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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