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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eb973de4e9e63dfa908c0fc59413c5b3925d0f14560ecf70116a31324df45a8' 
  AND token = '77DvnopMNOSLZeXldmu+ksdHvXsR53XZkF/EeBqsf+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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