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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2f0aff67ef229e6433dcef52bfbc44877480b24e899ca803c4b581232bd088c' 
  AND token = '8ux/5cowllSSF4gdY7yWeXrrnKcxBWSXlbPz4vx6gNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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