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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b78e0ab4471ded1a1dbe9f91402c9de33ddaffc4f0d5cf28d6068f18258b9ae' 
  AND token = '39nue6fG/Km47DZcmRRuCFyHmJfeDL5QZlBOgInoAVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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