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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72409308c950836af00baedd68a01bdaa678365d2b8cacba0e4e0c640b43352a' 
  AND token = 'n3vi7ArHD1f4ZvrO9t+j/ccWqkhnxaH4p26WP4Dk7oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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