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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3195dae6c69dab5bdd45167c61d27a8fb51f547ecf7c278260f350272ec326fd' 
  AND token = 'ffufR8sdz9cQp0W+xHqDudu4DRppCIyNjWuf2FR4Yng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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