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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feda44c82f3dec6d999c677a4a06e7b11c47a825449c97563230230f4b903690' 
  AND token = 'nPB0qmLyp2tr1LZxGXIsfJ/SGm++uHVRo1iT5GeePTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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