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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5e4dbb555d4fbe146ed4e5402522bdb7b7e94e2600e7bef56266f814a539ce7' 
  AND token = 'aIzpxei9cLOho8kQ0fBCyTnKJnGovLZkbum42YHR+Dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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