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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fc064410457bc18e542f4152a6a583f22eb9721412dc7d28fba34308ac488f6' 
  AND token = 'dF62ZtklivmHsq3m0Wuaa6vDopzky2LjhCHNHf+xVJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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