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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ac79a00451a0f2edf22f3b72f6e965d913d80d7a8ec3dada89010f41d8dc210' 
  AND token = 'DALZ1H7iLH4y0vHp1FUA9XYP07wiTxukE/113ZBmQsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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