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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ef1d9adae96578818410a911f91232d059e1a3c6749eca93a418c20c77a46d6' 
  AND token = '/j7LsSTzEM6d84/Lin48fJQUBiOOhBu+lh3M8SIL85A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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