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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f15708f3e1c804a800cc06c744fb2bcde022164436d8c7e328228e06b9c45e8' 
  AND token = 'Sz0G+sr6cxrM/zrq4EA8iriu7zydG4Ibv9mL/iuPXGc=' 
  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"
    }
  }
}