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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2056b3ee1dd18751aff25c34d01c0ea1e0180de4282d0ada8379e5be22555dc0' 
  AND token = '6OzwNVI55a9dxgVT6fnzAL82fcIjJpViQx5rNHbR8hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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