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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c48d41766e9c3d6c16408b882ba14762cdf59e955839ea16594755d6db72641' 
  AND token = 'j3DK74sse8aI5ZmZPM0ypS+sAODoqe5iv5zcoZlf5gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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