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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6f135d65f8b9fae025ee0c92f1daf241da3f68d6f38aac4cb3758dd1eac34dc' 
  AND token = 'hyWjvSOVOFyhfyT18rfPHXvfzzpGqD9WBHPtfED0hPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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