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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdb953ee823ed2aa6f889ca52d8f60d0c4a4693c45032d4349f541d927be0224' 
  AND token = 'gYLn3OWykkW+BrCgf45BXJf5IlOC1l58wwaZpIiHBO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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