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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97a4135e3059373448098b6d881033f339997d59788af571b62a74312de273f8' 
  AND token = '4DJx/88uEBECs+WAyoG7Nl7fdfUUHerLDQwh+833Qf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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