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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05bcad5145d360abfb4111631a767b7516da3ed0a9023646f861446b5a2bf5bd' 
  AND token = 'WwC7nRzz48zzpgL8989Y4I0Xe8lka1i4AK4e7JpNSa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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