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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81ac2dfed0fb3da6f79af75fba9d6afa9896251ad7fe74a0cf8d8abe179979df' 
  AND token = 'nqttZ1pv2yGrv6A5bRhn1tczpz11qec0vcFZOUOKFbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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