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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4364349e8765a293187cf2b058816270a7a8bb06c5541fa8771bbc241534e47' 
  AND token = '5IEdq5M+tweW+LlpB00h8PhypaCVM7p/SaTsyVfOY8Q=' 
  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"
    }
  }
}