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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d52fc636040313f5fa514c6046b1bd6e70c4d90e0ac9fe5f5882260d0ed3ea0' 
  AND token = 'AGm+0h/1/GN85iZ6S49cOdj6fRes6jYiupOk/8xcc0w=' 
  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"
    }
  }
}