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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd4aa4e664e75673cead7676934c23a374fe12c46cda4003a75781c3e8ac94da' 
  AND token = 'lrbFs/LcPW1G33HHuXvBz5smxhh2DrYsaV/RAVjUu2I=' 
  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"
    }
  }
}