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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb91622c8362dd0373e1e3ecdee079f014cbca3fa03f7f970c7bc914f023e7c3' 
  AND token = 'jqaEkm2+HJ61Naxwy7MSGNkTLzuc7W5tYchtex9EA5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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