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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51142acfc82ebddcce256389edcaf3bf1e24b927eee7855d0180bb01343188e8' 
  AND token = 'GtgvVtYGffliqs5E7dx3Wy3/r8hr/h7G0KIUd2EXpOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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