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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab57846f297cbad42766e861e6cb83ce5cf60c6b5764575350f7f78c335e8013' 
  AND token = 'UIepbq8rdkKnEF37rDjSr6NITlrVEjcvz6eiaIfDdOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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