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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dbb7500ce804a217aa4e46e660730564519218c1130e123c32b780f125e3ee8' 
  AND token = 'k+aPI3YM5UG3YyO3hTv2yQq+GumOcDF/AZEchZKseSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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