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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cc9d6d8d58b6f6df41de8bd6e357e4872c3255a1cf79545ab80e7f41e6e988d' 
  AND token = 'reFBtlFzVLyvpqr1ZZZ9L46PZ1E/7VKdbd7yi+PIYDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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