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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d0f02a121514dcecb886807b91d777328dd6cff0a9642ce1c3e954d8737d437' 
  AND token = '2dlsDfiSf97QWXBdh/8+iFCCjxJ31QaAnagRWMj7IVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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