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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dd0054dc79f66de0014e1c5249cb2a77397d2b6f4b512addda74ef7ca317261' 
  AND token = 'Df09UiyQr2MRy1AoIgChiabp6ahj+gM8V6UaJxEBuxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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