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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5617831f2a82dc3e8d03ba89c7e1eaf86937fc3e10be8fe30684dc97ee3a1cc6' 
  AND token = 'z8udRxpczzTleAjnd+VdGS/0ByU7uWa2fPrgPnXVy6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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