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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5470e49759df38efcba3bf49231aad371734d88246ad07070677b0ee64a973d8' 
  AND token = '69mQtkB2M4bck/hhr3i9iLDquRPfNHhIUpt+VJHDjhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00277

JSON explain

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