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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1507e8bc00c9577b84f39da9023f426222a87686664eeb1ac1c90591e183eb15' 
  AND token = 'KzPMWKeCb3Ckbrt89zrs+2+070xbhMN08WvfglWBOfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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